JP2653096B2 - Tape drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape drive device used for a magnetic recording / reproducing device and the like, and more particularly to a tape drive device capable of changing a tape transfer speed at a high speed while appropriately maintaining a tape tension. It relates to a tape drive.

2. Description of the Related Art Conventional tape transport devices include the following devices. That is, a speed control mode and a tension control mode are separately provided in a control system of a reel for performing a tape transfer, and each mode is used properly according to various states. For example, as shown in FIG. 4, the drive command determining means 31, 32 selects either the speed error measured value or the tension measured value by the switching means 33, 34, respectively, and selects the speed control or the tension control. .

As an example of controlling the tape tension and the tape speed at the same time using the measured value of the tape tension and the measured value of the speed error, there is an example in a capstan control system of a double capstan system in a broadcast VTR. It does not correspond to the case where changes occur.

Problems to be Solved by the Invention However, the following problems have been observed in the configuration described above. In a device that drives the tape in either the speed control mode or the tension control mode depending on the state, it is necessary to sacrifice the controllability of the tension to some extent when it is desired to change the tape speed at a high speed. In order to maintain this, it was necessary to set the rising speed slow.

In addition, if the speed and tension are to be controlled simultaneously, the control system becomes a complicated non-linear system, so if the tape speed changes every moment, the characteristics of the control system must be changed according to the situation. However, in practice, control was performed at a constant tape speed.

The present invention has been made in view of the above problems, and has as its object to provide a tape transfer device capable of responding to various conditions and enabling high-speed mode transition.

Means for Solving the Problems In the present invention, the drive command of the reel is determined using fuzzy inference. Then, the tape tension and the tape transfer speed are simultaneously controlled by using the measured tension value and the measured speed error value as the input of the fuzzy inference.

Operation By using fuzzy inference for determining a drive command, a control system corresponding to various situations can be configured, so that it is possible to respond to various modes without setting a complicated sequence. Also, by simultaneously using the measured value of the speed error and the measured value of the tension, it is possible to change the tape transfer speed at a high speed while maintaining the tape tension at an appropriate value.

Embodiment FIG. 1 is a configuration diagram showing a configuration of an embodiment of the present invention. In FIG. 1, reference numerals 11 and 13 indicate a supply side (hereinafter, S
The motors and reels 12 and 14 are motors and reels on the take-up side (hereinafter, T side). The tape is passed between the S-side and T-side reels, and is swept by a scanner 19 provided in the middle. The tape tension between the tape passes is determined by an S-side tension detector.
17 and a T-side tension detector 18. The outputs of both tension detectors are respectively
Input to 3, 24 and output as tension measurement value. The speed error measuring means 21 is means for measuring the tape transfer speed, and the speed detectors 15, 16 on the S side and the T side.
Then, the rotation speeds of both reels detected are calculated and converted into a tape transfer speed, and then compared with a speed reference value, and the result is output as a speed error measurement value. The speed can be directly measured by a timer roller or the like. The S-side drive command determining means 41 receives the speed error measurement value and the tension measurement value as inputs and outputs a drive command. The S-reel drive circuit operates according to the drive command.
Control. Similarly, the T-side drive command determining means 42
A drive command is output to the T reel drive circuit 26, and the T reel drive circuit 26 controls the T reel motor 12.

Hereinafter, the operation of the drive command determining means will be described. Here, the operation of the S-side drive command determination means 42 will be described as an example, but the same applies to the T-side drive command determination means 43.

The function of the drive command determining means is to output a command for controlling the rotation of the reel so that the tape tension and the speed are both at proper values. For this purpose, the tension measurement value and the speed error measurement value are input. And a fuzzy inference that outputs the change amount of the reel drive command is performed. Fuzzy inference is an inference method that determines the output according to linguistically described control rules. By reflecting knowledge based on human experience and intuition in the rules, it is possible to design a control system that meets the requirements . There is also an advantage that it is strong against a change in the characteristics of the system.

As the control rules, for example, those shown in Table 1 can be considered. If the input is the velocity error measurement (VE) and the tension measurement (TEN), the combination of rules is 2
Represented by a dimensional matrix Each rule is that if the speed error (VE) is negative and large (NL) and the tension (TEN) is very small (SS), the change in the rotational speed command value (DD) is very large (P
L) It's like saying Inputs and outputs are represented by fuzzy variables which are ambiguous expressions such as negative, large, very small, etc., and each fuzzy variable is defined by a membership function as shown in FIG. . The tension is [0,
1], and is SS (very small) to LL
(Very large) up to five fuzzy variables are defined, and the velocity error is normalized to the interval [-1,1] as shown in FIG. 5 fuzzy variables are defined. The output is the change amount (DD) of the motor rotation speed command value.
It is defined as shown in FIG.

Hereinafter, the actual fuzzy inference process will be described with reference to FIG. First, find the conclusion for each rule. For example, the above rule (if VE = NL and TEN = SS th
en DD = PL), the variables of the antecedent part and the MAX of the input value are taken and their M
The fitness of the antecedent part is obtained by taking IN, and the result of taking the MIN of the consequent variable and the fitness of the antecedent part is the conclusion of this rule. After applying the same steps to each rule and obtaining the conclusion for each rule, a MAX of all the conclusions is obtained, and a value corresponding to the center of gravity of the membership function is determined as an inference result.

Execution of such inference can be realized by using a general-purpose microcomputer or digital signal processor. It is also possible to use a dedicated fuzzy arithmetic chip.

With the above configuration, the reel is controlled in consideration of both the speed error and the tension, so when changing the tape transfer speed, it is possible to change the tape tension at high speed while maintaining the tape tension in an appropriate range. Become.

In the above description, both reels are controlled in the mode in which the speed and the tension are simultaneously controlled. However, depending on the configuration of the rule, a mode in which only the tension is controlled is also possible. It is also possible to use. Further, since various variations can be considered for the inference method, an inference method other than the illustrated one can also be used.

Furthermore, information on the diameter of the tape, the amount of change in the tape transfer speed, and the like can also be used as input variables for fuzzy inference. In this case, a more accurate control system can be configured by comprehensively determining a large amount of information.

Effect of the Invention As described above, according to the present invention, the tape transfer speed can be changed at a high speed while the tape tension is appropriately maintained, so that a quick mode transition is possible.
In addition, since fuzzy inference is used, it is easy to capture the intuition of the designer and to configure a control system having characteristics that meet the requirements.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a diagram showing the definition of fuzzy variables, FIG. 3 is a diagram for explaining the fuzzy inference process, and FIG. It is a block diagram. 11, 12 ... reel motor, 21 ... speed error measuring means, 2
3, 24: tension measuring means, 41, 42: drive command determining means.

Claims (2)

(57) [Claims] 1. A tape drive device for controlling the running of a tape passed between two reels by a motor for driving the reels, comprising: a sensor for detecting a tape tension and a tape transfer speed; and a detection amount of the sensor. And a drive command determining means for controlling a tape tension and / or a tape transfer speed by performing fuzzy inference with the input as the input, and the drive command determining means determines a reel drive command from the detected amount. Based on the result of combining the conclusion of the weighted rule by weighting the rule consequent based on the input detection amount and the fitness obtained from the antecedent part membership function for the rule. A tape drive device that outputs a reel drive command determined by the following. 2. A tape drive device for controlling the running of a tape passed between two reels by a motor for driving the reels, comprising: a sensor for detecting a tape tension and a tape transfer speed; And a drive command determining means having a mode for controlling both the tape tension and the tape transfer speed by performing fuzzy inference with the input as the input. A rule having a rule for inferring a drive command, a result obtained by weighting the rule consequent part based on the input detection amount and the conformity obtained from the antecedent part membership function for the rule, and synthesizing a conclusion of the weighted rule A tape drive device that outputs a reel drive command determined based on the reel drive command.